>> a belief or an action that is inconsistent with science. it needs to be aimed at bringing about good luck or avoiding bad luck. >> reporter: count yourself lucky if you're not superstitious. connecticut college psychologist stewart says most people are. in a world where we prize science, it may not be something to be proud of. >> i think only 40% of americans believe in evolution. >> reporter: what percent of americans believe in superstition. >> over half of americans have some kind of superstition that they believe in. >> reporter: so more americans have some specific superstition than believe in he have heution. >> that's right. that's not a good thing. >> reporter: a new cbs news poll for sunday morning finds more than half of all americans, knock on wood to avoid bad luck. 16% won't open up as indoors. 13% carry a good luck charm. and one in ten avoids black cats. at halloween we even have a holiday that celebrates our superstitions. nowhere are they celebrated more than here at the blood manor haunted house in new york city where you'